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1 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 general description the aat4686 ovpswitch? is a member of analogictech?s application specific power mosfet? (aspm?) product family. it is a p-channel mosfet driver ic with precise over-voltage protection control, designed to protect low- voltage systems against high-voltage faults up to +28v. if the input voltage exceeds the programmed over-volt- age threshold, the external p-channel mosfet switch will be turned off to prevent damage to the output load circuits. the aat4686 is available with an internally pro- grammed over-voltage trip point or as an adjustable version programmed by a two external resistors. the aat4686 also includes an under-voltage lockout (uvlo) protection circuit, which will put the device into sleep mode at low input voltages only consuming < 1 a of current. the aat4686 is offered in a small pb-free, 8-pin sc70jw package, and is specified for operation over the -40c to +85c ambient temperature range. features ? over-voltage protection up to 28v ? ( fixed or adjustable) over-voltage protection threshold ? fast ovp response: ? 1 s (max) to over-voltage transient ? low operation quiescent current ? 30 a typical ? 1 a max in shutdown (disabled) ? drives external p-channel mosfets ? under-voltage lockout ? temperature range: -40 to 85c ? available in SC70JW-8 package applications ? cell phones ? digital still cameras ? gps ? mp3 players ? personal data assistants (pda) ? usb hot swap / live insertion devices typical application 1f in flt en gate gnd v in fault flag v out 3.75v C 28v +5v fixed version* 1f in ovp flt en gate gnd v in fault flag v out 3.75v C 28v +5v adjustable version * contact manufacturer for available options.
2 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 pin descriptions pin # symbol function fixed adj. 1 in power input pin. connect a 1 f capacitor from in to gnd. 2 gate gate connection to external p-channel mosfet. 3 gnd ground. n/c 4 nc/ovp fixed version: not connected. adjustable version: over-voltage protection threshold input. 5 flt over-voltage fault reporting. 6, 7, 8 en enable input, active low. when connected high, the device shuts down and draws less than 1.0 a of current. an internal pull-down resistor is connected to this pin. pin configuration fixed ovp trip adjustable ovp trip voltage version voltage version SC70JW-8 SC70JW-8 (top view) (top view) gate gnd n/c en en en flt in 1 2 3 45 6 7 8 gate gnd ovp en en en flt in 1 2 3 45 6 7 8
3 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 absolute maximum ratings 1 symbol description value units v in in to gnd -0.3 to 28 v v ovp ovp to gnd -0.3 to 6.5 v v flt , v en flt, en to gnd -0.3 to 6.5 v v gate gate to gnd 28 v t j operating junction temperature range -40 to 150 c thermal characteristics symbol description value units ? ja maximum thermal resistance 2 225 c/w p d maximum power dissipation 2, 3 440 mw 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at co nditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on a fr4 board. 3. derated 4.4mw/c above 25c
4 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 electrical characteristics 1 v in = 5v, t a = -40 to 85c unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units v in normal operation voltage range 3 14 v i q operation quiescent current v in = 5v, en = 0v, i out = 0 30 50 a i sd(off) shutdown supply current en = in, v in = 5.5v, v out = 0 1 a v uvlo under-voltage lockout threshold rising edge 3 3.3 v v uvlo_hys under-voltage lockout hysteresis 0.1 v adjustable v ovp_th over-voltage lockout threshold, ovp pin rising edge 1.083 1.1 1.117 v v ovp_hys over-voltage lockout threshold hysteresis, ovp 20 mv fixed v ovpt over-voltage protection trip voltage rising edge 6.5 v v ovp_hys over-voltage protection trip point hysteresis, in pin 120 mv gate output v ghl gate voltage high level en = v in v in v v gll gate voltage low level 2 v in - 5v v i g gate current 1 a logic v en(l) en input low voltage 0.4 v v en(h) en input high voltage 1.6 v i en en input leakage v en = 5.5v or 0v 0.5 2.0 a flt ol flt output voltage low i flt = 1ma 0.4 v flt iol flt output leakage current 1 a t blk_flt flt blanking time from de-assertion of ov 5 10 15 ms t d_flt flt assertion delay time from over-voltage (ov) from assertion of ov 1 s t resp_ov over-voltage response time v in = 5v, v ovp rise to 1.13v from 1.07v in 1ns 0.7 s t on gate turn on delay time v in = 5v; c g = 400pf 10 ms t r gate turn on fall time v in = 5v; c g = 400pf 4 ms t off gate turn off delay time v in = 5v; c g = 400pf 6 ms 1. the aat4686 is guaranteed to meet performance specification over the -40 to 85c operating temperature range and are assured by design, characterization and correlation with statistical process controls. 2. v gs (i.e. v in_gate ) is clamped to typical 5v.
5 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 typical characteristics operation quiescent current vs. supply voltage supply voltage (v) quiescent current (a) 0 5 10 15 20 25 30 35 40 45 50 3 4 5 6 7 8 9 101112131 4 operation quiescent current vs. temperature temperature (c) quiescent current (a) 15 20 25 30 35 40 -40 -15 10 35 60 8 5 shutdown supply current vs. supply voltage supply voltage (v) shutdown supply current (a) 0.0 0.6 1.2 1.8 2.4 3.0 2 4 6 8 10 12 14 16 18 20 22 24 26 2 8 shutdown supply current vs. temperature temperature (c) shutdown supply current (a) 0.00 0.07 0.14 0.21 0.28 0.35 -40 -15 10 35 60 85 flt blanking time vs. temperature temperature (c) flt blanking time (ms) 7 8 9 10 11 12 -40 -15 10 35 60 8 5 flt blanking time (v in = 5.0v) time (2ms/div) v out (1v/div) flt (2v/div) ovp (100mv/div) 4.3v 5.0v 0v 1.15v
6 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 typical characteristics undervoltage lockout threshold vs. temperature temperature (c) uvlo threshold (v) 1.50 2.00 2.50 3.00 3.50 4.00 -40 -15 10 35 60 85 v in falling v in rising over-voltage response time vs. temperature temperature (c) over-voltage response time (ns) 550 600 650 700 750 800 -40 -15 10 35 60 8 5 over-voltage lockout threshold (adjustable version) vs. temperature temperature (c) v ovp 1.06 1.07 1.08 1.09 1.10 1.11 1.12 -40 -15 10 35 60 8 5 v ovp_th v ovp_hys en input high voltage vs. supply voltage supply voltage (v) v en(h) (v) 0.6 0.7 0.8 0.9 1.0 1.1 3 4 5 6 7 8 9 101112131 4 85c 25c -40c en input low voltage vs. supply voltage supply voltage (v) v en(l) (v) 3 4 5 6 7 8 9 101112131 4 0.6 0.7 0.8 0.9 1.0 1.1 -40c 25c 85c turn off delay time (v in = 5.0v, r o = 10 ) time (2ms/div) v out (2v/div) en (2v/div) 0v 4.84v
7 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 typical characteristics turn on delay time (v in = 5.0v, r o = 10 ) time (2ms/div) v out (2v/div) en (2v/div) 0v 0v
8 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 functional description in conjunction with an external p-channel power mosfet, the aat4686 provides up to 28v over-voltage protection when powering low-voltage systems such as cell phones, mp3, and pdas or when charging lithium-ion batteries from a poorly regulated supply. the p-channel mosfet is inserted between the power supply or charger source and the load to be protected. the aat4686 ic consists of a p-channel mosfet slew-rate controlled driver, under-voltage lockout protection, over-voltage monitor, fast shutdown circuitry, and a fault output flag. in normal operation, the p-channel mosfet is controlled by the aat4686, connecting and disconnecting the power supply from in to out. a low resistance mosfet is used to minimize the voltage drop between the volt- age source and the load and to reduce the power dissi- pation. any p-channel mosfet can be used; however, the turn-on and turn-off speed will vary inversely pro- portionately to the mosfet on-resistance. when the input voltage exceeds the programmed voltage limit (internally set or externally by a voltage divider to the ovp pin), the device immediately turns off the external p-channel fet, disconnecting the load from the abnormal voltage and thus preventing damage to any downstream components. simultaneously, the fault flag is raised, alerting the system to a problem. if an over-voltage condition is applied at the time of the device enable, then the switch will remain off. the aat4686 can also be used as a simple slew-rate controlled p-channel high side driver ic. under-voltage lockout (uvlo) the aat4686 has a fixed 3.0v under-voltage lockout level (uvlo). when the input voltage is less than the uvlo level, the mosfet is turned off. 100mv of hyster- esis is included to ensure circuit stability. functional block diagram fixed option ovp sense and control gnd gate flt in ovp en
9 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 over-voltage protection the aat4686 adjustable version has a 1.1v ?? 1.5% over- voltage trip threshold on the ovp pin. with a resistor divider on ovp pin from in to gnd, the over-voltage trip point can be adjusted anywhere within the input voltage range (see table 1). once the over-voltage trip level is triggered, the external pmos switch controller will shut off the pmos in less than 1 s. the aat4686 fixed version is also available with the resistor divider internally integrated and the input volt- age trip point at 6.5v. the fixed version of the aat4686 does not have a connection to the internal ovp circuitry and pin 4 is designed to be not connected. flt output the flt output is an active-low open-drain fault (ov) reporting output. a pull-up resistor should be connected from flt to the logic i/o voltage of the host system. flt will be asserted immediately if an over-voltage fault occurs (only about a 1 s inherited internal circuit delay). a 10ms blanking is applied to flt signal prior to de- assertion. en input en is an active-low enable input. en is driven low, con- nected to ground, or left floating for normal device operation. taking the en high turns off the mosfet. in the case of an over-voltage or uvlo condition toggling the en will not override the fault condition and the switch will remain off. device operation on initial power-up, if v in < uvlo or if v ovp > v ovp_th (1.1v), the pmos is held off. if uvlo < v in , v ovp < v ovp_ th , and en is low, the device enters startup after a 10ms internal delay. application information over-voltage protection the aat4686 over-voltage protection circuit provides fast protection against transient voltage spikes and short duration spikes of high voltage from the power supply lines. the aat4686 can quickly disconnect the input sup- ply from the load and not cause any damage to sensitive components. in portable product applications, if the user removes the battery pack during charging, this action can create large transients and a high voltage spike can occur which can damage other electronic devices in the product such as the battery charger. a hot plug of the ac/dc wall adapt- er into the ac outlet can create and release a voltage spike from the transformer. as a result, some sensitive devices within the product can be damaged. with the aat4686 placed between the power lines and the sensi- tive devices, the voltage spike can be kept away and the input supply disconnected from other devices in 0.7 s. figure 2 shows the response time of over-voltage pro- tection from the test circuit (figure 1). the input voltage is rapidly increased from 5v to 12v by a voltage surge or voltage spike. the voltage at the ovp pin is also increased until the trip point is triggered. at this point, the flt pin is pulled low and the output voltage starts to fall. figure 3 shows a zoom-in scope capture of the ovp response time; the output is disconnected from the input in as little as 700ns. adjustable version - over-voltage protection resistors the over-voltage protection threshold is programmed with two resistors, r1 and r2. to limit the current going through the external resistor string while maintaining good noise immunity, use smaller resistor values, such as 10k for r2. using a larger value will further reduce the system current, but will also increase the impedance of the ovp node, making it more sensitive to external noise and interference. v ovp = v ovp_th 1 + r 1 r 2
10 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 a suggested value for r2 is 110k and r1 can be calcu- lated from the following formula once the over-voltage protection voltage is set. r 1 = r 2 - 1 v ovp v ovp_th table 1 summarizes resistor values for various over- voltage settings. use 1% tolerance metal film resistors for programming the desired ovp setting. r2 (k ) r1 (k ) v ovp setting (v) 110 487 6.0 110 536 6.5 110 787 9.0 110 1050 11.5 110 1300 14.0 110 1540 16.5 110 1780 19.0 110 2050 21.5 110 2320 24.0 110 2550 26.5 table 1: recommended ovp setting for aat4686 adjustable version 1 . 10 load 1 2 3 4 8 7 6 5 vin fault vout aat4686 scope gnd ovp gnd +12v +5v figure 1: over-voltage protection response time test circuit. time (200s/div) v out (5v/div) v in (5v/div) ovp (50mv/div) flt (2v/div) ovp trip point (1.1v) 12v output load = 10 c out = 1f time (500ns/div) v out (100mv/div) ovp (200mv/div) flt (2v/div) 0.7s output load = 10 no c out 1.23v 5v 1.03v figure 2: typical over-voltage response time. figure 3: typical over-voltage response time [zoom in]. 1. mimimum ovp voltage setting = 5v.
11 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 input capacitor a 1 f or larger capacitor is typically recommended for c in . c in should be located as close to the device vin pin as practically possible. ceramic, tantalum, or aluminum electrolytic capacitors may be selected for c in . there is no specific capacitor equivalent series resistance (esr) requirement for c in . however, for higher current opera- tion, ceramic capacitors are recommended for c in due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. capacitors are typically manufactured in different volt- age ratings. 16v, 25v, and 50v are good for ovp applica- tions. if the maximum possible surge voltage is known, select capacitors with a voltage rating at least 5v higher than the maximum possible surge voltage. otherwise, 50v rated capacitors are generally good for most ovp applications to prevent any surge voltage. output capacitor in order to insure stability while current limit is active, a small output capacitance of approximately 1 f is required at the output. likewise, with the output capac- itor, there is no specific capacitor esr requirement. if desired, c out may be increased to accommodate any load transient condition. fault flag a fault flag is provided to alert the system if the aat4686?s input voltage has passed the pre-programmed over-voltage trip point. since the fault is open drain pin, it should be pulled up to input/output voltage rail and less than the maximum operating voltage of 6.5v. thermal considerations and high output current applications the aat4686 is designed to deliver a continuous output load current. the limiting characteristic for maximum safe operating output load current is package power dis- sipation. in order to obtain high operating currents, careful device layout and circuit operating conditions must be taken into account. the following discussions will assume the load switch is mounted on a printed cir- cuit board utilizing the minimum recommended footprint as stated in the ?printed circuit board layout recommendations? section of this datasheet. at any given ambient temperature (t a ), the maximum package power dissipation can be determined by the following equation: p d(max) = t j(max) -t a ja constants for the aat4686 are maximum junction tem- perature (t j(max) = 125c) and package thermal resis- tance ( ja = 225c/w). worst-case conditions are calcu- lated at the maximum operating temperature, t a = 85c. typical conditions are calculated under normal ambient conditions where t a = 25c. at t a = 85c, p d(max) = 175mw. at t a = 25c, p d(max) = 440mw. the maximum continuous output current for the aat4686 is a function of the package power dissipation and the r ds of the mosfet at t j(max) . the maximum r ds of the mosfet at t j(max) is calculated by increasing the maxi- mum room temperature. for maximum current, refer to the following equation: = i out(max) p d(max) r ds printed circuit board layout recommendations for proper thermal management, certain circuit board layout rules should be followed: vin and vout should be routed using wider than normal traces, and gnd should be connected to a ground plane. to maximize package thermal dissipation and power handling capacity of the aat4686 SC70JW-8 package, the ground plane area con- nected to the ground pins should be made as large as possible. for best performance, c in and c out should be placed close to the package pins; see figures 4 and 5.
12 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 figure 4: aat4686 evaluation board figure 5: aat4686 evaluation board component side layout. solder side layout. vout vin r1 110k r2 +5v 1.5k r3 ds1 red led 1f c1 1f c2 enable jp1 s 1 s 2 s 3 g 4 d 5 d 6 d 7 d 8 aat8303 u2 SC70JW-8 vin 1 gate 2 gnd 3 ovp 4 flt 5 en 6 en 7 en 8 aat4686 u1 SC70JW-8 r1 (k ) v ovp_setting (v) 487 6.0 536 6.5 787 9.0 1050 11.5 1300 14.0 (c1 1206 x7r 2.2f 50v grm31cr71h225ka88l) (c1 1210 x7r 4.7f 50v grm32er71h475ka88l) output cap, c2 for under 13v application, c2 0805 x7r 1f 16v grm21br71c105ka01 (for under 20v application, c2 0805 x7r 1f 25v grm219r71e105ka88) input cap, c1 c1 1206 x7r 1f 50v grm31mr71h105ka88 figure 6: aat4686 evaluation board schematic.
13 aat4686 mosfet driver ic with over-voltage protection data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201961a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 17, 2012 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (?skyworks?) products or services. these m aterials, including the information contained herein, are provided by skyworks as a service to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. sky- works may change its documentation, products, services, speci cations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or informati on and shall have no responsibility whatsoever for con icts, incompatibilities, or other dif culties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be p rovided in skyworks terms and conditions of sale. the materials, products and information are provided ?as is? without warranty of any kind, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual property right; all such warranti es are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. sk yworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, including without limitation , lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design speci cations. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liabi lity for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated published speci cations or parameters. skyworks, the skyworks symbol, and ?breakthrough simplicity? are trademarks or registered trademarks of skyworks solutions, inc ., in the united states and other countries. third-party brands and names are for identi cation purposes only, and are the property of their respective owners. additional information, including relevant terms and co nditions, posted at www.skyworksinc.com, are incorporated by reference. ordering information package ovp trip voltage marking 1 part number (tape and reel) 2 SC70JW-8 adjustable yaxyy aat4686ijs-t1 SC70JW-8 6.5v aat4686ijs-6.5-t1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?ition of green , document number sq04-0074. package information SC70JW-8 0.225 all measurements in millimeters. 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold .

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